Phys. Rev. A 78, 022320 (2008) [7 pages]Discrimination of the binary coherent signal: Gaussian-operation limit and simple non-Gaussian near-optimal receiversReceived 20 January 2008; revised 21 May 2008; published 13 August 2008 We address the limit of the Gaussian operations and classical communication in the problem of quantum state discrimination. We show that the optimal Gaussian strategy for the discrimination of the binary phase shift keyed (BPSK) coherent signal is a simple homodyne detection. We also propose practical near-optimal quantum receivers that beat the BPSK homodyne limit in all areas of the signal power. Our scheme is simple and does not require realtime electrical feedback. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.78.022320
DOI:
10.1103/PhysRevA.78.022320
PACS:
03.67.Hk, 42.50.Dv
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